Calibration
R&S
®
FPC
55
User Manual 1178.4130.02 ─ 07
The correction data between the reference points of the calibration is interpolated.
Interpolation is used when you change one of the frequency parameters (start, stop
or center frequency). In that case, the distribution of the measurement points is dif-
ferent to the distribution during calibration. This could result in an increasing mea-
surement uncertainty.
Calibration types
●
Normalize S21
Normalization is a simple way to calibrate the measurement using one calibration
standard only. The correction data is deducted from this measurement. As only one
calibration standard is used, the isolation between the test ports is ignored. A pos-
sible cross-talk between the test ports is therefore not eliminated.
Available for the following measurements: transmission S21, spectrum measure-
ments with signal source.
Required calibration standards: through.
●
Full 1-Port
Test port 1 is calibrated for reflection measurements over the complete frequency
range of the R&S
FPC. The calibration requires the calibration standards open,
short and load to be connected one after another.
Available for the following measurements: reflection S11, 1-port cable loss, DTF.
Required calibration standards: open, short, load.
●
Easy 1-Port
Test port 1 is calibrated for measurements on that port. The calibration requires no
calibration standards as the R&S
FPC tests an open only.
●
1-Port Selective Span
Test port 1 is calibrated for reflection measurements over the currently selected fre-
quency range (span). The calibration requires the calibration standards open, short
and load to be connected one after another.
Available for the following measurements: reflection S11, 1-port cable loss, DTF.
Required calibration standards: open, short, load.
Selecting a calibration kit
Every calibration kit has different phase characteristics. Therefore, you have to specify
the calibration kit you are using to avoid phase errors during calibration. The R&S
FPC
then corrects the measurement results accordingly.
You can either use one of the calibration kits designed for use with the R&S
FPC, for
example the R&S
FSH-Z28 and -Z29 calibration kits. Those kits provide an "Open",
"Short" and "Load" calibration standard in one piece. The characteristics of these cali-
bration kits are already stored in the R&S
FPC firmware.
In addition, you can create and edit calibration kits with the R&S
InstrumentView soft-
ware package and then transfer them to the R&S
FPC.
When you use calibration kits, make sure that the electrical length of the calibration kit
is similar to that of the R&S
FSH
‑
Z28 or
‑
Z29. The electrical length of the "Open" and
"Short" of these calibration kits is 5.27
mm. If the electrical length is different, an addi-
tional phase error can occur.
1. Press the "Meas" key to enter the measurement menu.
